Ohio Andy
Well-known member
I purchased a few proto socket sets and one socket in the set has four holes drilled in it in the base all the way through 90° apart

The socket on the left is the 22 mm and the socket on the right is the 21 mm.
The part numbers look okay but clearly these things are labeled differently..
Any thoughts on why there are four holes drilled into the bottom of this 21 mm socket

The socket on the left is the 22 mm and the socket on the right is the 21 mm.
The part numbers look okay but clearly these things are labeled differently..
Any thoughts on why there are four holes drilled into the bottom of this 21 mm socket
